Ubiquitin-protein ligase E3A (UBE3A) also known asE6AP ubiquitin-protein ligase (E6AP) is anenzyme that in humans is encoded by theUBE3Agene. This enzyme is involved in targetingproteins for degradation withincells.
Protein degradation is a normal process that removes damaged or unnecessary proteins and helps maintain the normal functions of cells.Ubiquitin protein ligase E3A attaches a small marker protein calledubiquitin to proteins that should be degraded. Cellular structures calledproteasomes recognize and digest proteins tagged with ubiquitin.
Collision model of UBE3A
Both copies of theUBE3A gene are active in most of the body's tissues. In mostneurons, however, only the copy inherited from a person's mother (the maternal copy) is normally active; this is known as paternalimprinting. Recent evidence shows that at least someglial cells and neurons may exhibit biallelic expression ofUBE3A.[5][6] Further work is thus needed to delineate a complete map ofUBE3A imprinting in humans and model organisms such as mice. Silencing ofUbe3a on the paternal allele is thought to occur through theUbe3a-ATS part of alincRNA called "LNCAT"[7] (Large Non-Coding Antisense Transcript).
TheUBE3A gene is located on the long (q) arm ofchromosome 15 between positions 11 and 13, frombase pair 23,133,488 to base pair 23,235,220.
Mutations within theUBE3A gene are responsible for some cases ofAngelman syndrome andPrader-Willi syndrome. Most of these mutations result in an abnormally short, nonfunctional version of ubiquitin protein ligase E3A. Because the copy of the gene inherited from a person's father (the paternal copy) is normally inactive in the brain, a mutation in the remaining maternal copy prevents any of the enzyme from being produced in the brain. This loss of enzyme function likely causes the characteristic features of these two conditions.[citation needed]
TheUBE3A gene lies within the human chromosomal region 15q11-13. Other abnormalities in this region ofchromosome 15 can also cause Angelman syndrome. These chromosomal changes include deletions, rearrangements (translocations) of genetic material, and other abnormalities. Like mutations within the gene, these chromosomal changes prevent any functional ubiquitin protein ligase E3A from being produced in the brain.
UBE3A associates with the E6 protein of certain strains ofHPV. This interaction promotes the polyubiquitination and subsequent degradation of the tumor suppressor genep53, thereby enabling the immortalization of infected cells.[8] Strains of HPV with this ability have a higher risk of causingHPV-associated cancers. UBE3A is also known as E6AP orE6-associated protein in reference to this mechanism.
^Runte M, Hüttenhofer A, Gross S, Kiefmann M, Horsthemke B, Buiting K (November 2001). "The IC-SNURF-SNRPN transcript serves as a host for multiple small nucleolar RNA species and as an antisense RNA for UBE3A".Human Molecular Genetics.10 (23):2687–700.doi:10.1093/hmg/10.23.2687.PMID11726556.
^Kim S, Chahrour M, Ben-Shachar S, Lim J (July 2013). "Ube3a/E6AP is involved in a subset of MeCP2 functions".Biochemical and Biophysical Research Communications.437 (1):67–73.doi:10.1016/j.bbrc.2013.06.036.PMID23791832.
^abAnan T, Nagata Y, Koga H, Honda Y, Yabuki N, Miyamoto C, Kuwano A, Matsuda I, Endo F, Saya H, Nakao M (November 1998). "Human ubiquitin-protein ligase Nedd4: expression, subcellular localization and selective interaction with ubiquitin-conjugating enzymes".Genes to Cells.3 (11):751–63.doi:10.1046/j.1365-2443.1998.00227.x.PMID9990509.S2CID1653536.
^Huang L, Kinnucan E, Wang G, Beaudenon S, Howley PM, Huibregtse JM, Pavletich NP (November 1999). "Structure of an E6AP-UbcH7 complex: insights into ubiquitination by the E2-E3 enzyme cascade".Science.286 (5443):1321–6.doi:10.1126/science.286.5443.1321.PMID10558980.
